Leprechaun is bugged

That's what is so great about CK, it adds a whole new level of difficulty to MS.

Challenge can be achieved without robbing you of experience.

For example, Ellinia has a JQ or two that were very challenging. But when I did them, I didn't lose exp or a charm. Gatekeeper is a tough to fight monster, but making a small mistake while fighting him won't necessarily end with me dying. But making a small mistake in the JQ to the keep is instant death, and making a small mistake by walking up (or, for Magicians/Nightlords, blindly teleporting/flashjumping up) to an aggro'd one of these guys would also spell instant death.

They just want people to spend more money on charms. That's why they've made the Keep the way they have. They didn't set out to make a good or fun place, they set out to make a place that will kill you.